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llvm-project/clang/test/CodeGen/temporary-lifetime.cpp
Nikita Popov c23b4fbdbb
[IR] Remove size argument from lifetime intrinsics (#150248) 
Now that #149310 has restricted lifetime intrinsics to only work on
allocas, we can also drop the explicit size argument. Instead, the size
is implied by the alloca.

This removes the ability to only mark a prefix of an alloca alive/dead.
We never used that capability, so we should remove the need to handle
that possibility everywhere (though many key places, including stack
coloring, did not actually respect this).
2025-08-08 11:09:34 +02:00

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// RUN: %clang_cc1 -no-enable-noundef-analysis %s -std=c++11 -O1 -DWITH_DTOR -triple x86_64 -emit-llvm -o - | FileCheck -check-prefix=CHECK-DTOR %s
// RUN: %clang_cc1 -no-enable-noundef-analysis %s -std=c++11 -O1 -triple x86_64 -emit-llvm -o - | FileCheck -check-prefix=CHECK-NO-DTOR %s
struct A {
A();
#ifdef WITH_DTOR
~A();
#endif
char a[1024];
operator bool() const;
};
template <typename T>
void Foo(T &&);
template <typename T>
void Bar(T &&);
template <typename T>
T Baz();
void Test1() {
// CHECK-DTOR-LABEL: Test1
// CHECK-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR:.+]])
// CHECK-DTOR: call void @_ZN1AC1Ev(ptr nonnull {{[^,]*}} %[[VAR:[^ ]+]])
// CHECK-DTOR: call void @_Z3FooIRK1AEvOT_
// CHECK-DTOR: call void @_ZN1AD1Ev(ptr nonnull {{[^,]*}} %[[VAR]])
// CHECK-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR]])
// CHECK-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR:.+]])
// CHECK-DTOR: call void @_ZN1AC1Ev(ptr nonnull {{[^,]*}} %[[VAR:[^ ]+]])
// CHECK-DTOR: call void @_Z3FooIRK1AEvOT_
// CHECK-DTOR: call void @_ZN1AD1Ev(ptr nonnull {{[^,]*}} %[[VAR]])
// CHECK-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR]])
// CHECK-DTOR: }
// CHECK-NO-DTOR-LABEL: Test1
// CHECK-NO-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR:.+]])
// CHECK-NO-DTOR: call void @_ZN1AC1Ev(ptr nonnull {{[^,]*}} %[[VAR:[^ ]+]])
// CHECK-NO-DTOR: call void @_Z3FooIRK1AEvOT_
// CHECK-NO-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR]])
// CHECK-NO-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR:.+]])
// CHECK-NO-DTOR: call void @_ZN1AC1Ev(ptr nonnull {{[^,]*}} %[[VAR:[^ ]+]])
// CHECK-NO-DTOR: call void @_Z3FooIRK1AEvOT_
// CHECK-NO-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR]])
// CHECK-NO-DTOR: }
{
const A &a = A{};
Foo(a);
}
{
const A &a = A{};
Foo(a);
}
}
void Test2() {
// CHECK-DTOR-LABEL: Test2
// CHECK-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR1:.+]])
// CHECK-DTOR: call void @_ZN1AC1Ev(ptr nonnull {{[^,]*}} %[[VAR1:[^ ]+]])
// CHECK-DTOR: call void @_Z3FooIRK1AEvOT_
// CHECK-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR2:.+]])
// CHECK-DTOR: call void @_ZN1AC1Ev(ptr nonnull {{[^,]*}} %[[VAR2:[^ ]+]])
// CHECK-DTOR: call void @_Z3FooIRK1AEvOT_
// CHECK-DTOR: call void @_ZN1AD1Ev(ptr nonnull {{[^,]*}} %[[VAR2]])
// CHECK-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR2]])
// CHECK-DTOR: call void @_ZN1AD1Ev(ptr nonnull {{[^,]*}} %[[VAR1]])
// CHECK-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR1]])
// CHECK-DTOR: }
// CHECK-NO-DTOR-LABEL: Test2
// CHECK-NO-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR1:.+]])
// CHECK-NO-DTOR: call void @_ZN1AC1Ev(ptr nonnull {{[^,]*}} %[[VAR1:[^ ]+]])
// CHECK-NO-DTOR: call void @_Z3FooIRK1AEvOT_
// CHECK-NO-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR2:.+]])
// CHECK-NO-DTOR: call void @_ZN1AC1Ev(ptr nonnull {{[^,]*}} %[[VAR2:[^ ]+]])
// CHECK-NO-DTOR: call void @_Z3FooIRK1AEvOT_
// CHECK-NO-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR2]])
// CHECK-NO-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR1]])
// CHECK-NO-DTOR: }
const A &a = A{};
Foo(a);
const A &b = A{};
Foo(b);
}
void Test3() {
// CHECK-DTOR-LABEL: Test3
// CHECK-DTOR: call void @llvm.lifetime.start
// CHECK-DTOR: call void @llvm.lifetime.start
// if.then:
// CHECK-DTOR: call void @llvm.lifetime.end
// cleanup:
// CHECK-DTOR: call void @llvm.lifetime.end
// cleanup:
// CHECK-DTOR: call void @llvm.lifetime.end
// CHECK-DTOR: }
const A &a = A{};
if (const A &b = A(a)) {
Foo(b);
return;
}
Bar(a);
}
void Test4() {
// CHECK-DTOR-LABEL: Test4
// CHECK-DTOR: call void @llvm.lifetime.start
// for.cond.cleanup:
// CHECK-DTOR: call void @llvm.lifetime.end
// for.body:
// CHECK-DTOR: }
for (const A &a = A{}; a;) {
Foo(a);
}
}
int Test5() {
// CHECK-DTOR-LABEL: Test5
// CHECK-DTOR: call void @llvm.lifetime.start
// CHECK-DTOR: call i32 @_Z3BazIiET_v()
// CHECK-DTOR: store
// CHECK-DTOR: call void @_Z3FooIRKiEvOT_
// CHECK-DTOR: load
// CHECK-DTOR: call void @llvm.lifetime.end
// CHECK-DTOR: }
const int &a = Baz<int>();
Foo(a);
return a;
}
void Test6() {
// CHECK-DTOR-LABEL: Test6
// CHECK-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR:.+]])
// CHECK-DTOR: call i32 @_Z3BazIiET_v()
// CHECK-DTOR: store
// CHECK-DTOR: call void @_Z3FooIiEvOT_
// CHECK-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR]])
// CHECK-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR:.+]])
// CHECK-DTOR: call i32 @_Z3BazIiET_v()
// CHECK-DTOR: store
// CHECK-DTOR: call void @_Z3FooIiEvOT_
// CHECK-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR]])
// CHECK-DTOR: }
Foo(Baz<int>());
Foo(Baz<int>());
}
void Test7() {
// CHECK-DTOR-LABEL: Test7
// CHECK-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR:.+]])
// CHECK-DTOR: call void @_Z3BazI1AET_v({{.*}} %[[SLOT:[^ ]+]])
// CHECK-DTOR: call void @_Z3FooI1AEvOT_({{.*}} %[[SLOT]])
// CHECK-DTOR: call void @_ZN1AD1Ev(ptr nonnull {{[^,]*}} %[[SLOT]])
// CHECK-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR]])
// CHECK-DTOR: call void @llvm.lifetime.start.p0(ptr nonnull %[[ADDR:.+]])
// CHECK-DTOR: call void @_Z3BazI1AET_v({{.*}} %[[SLOT:[^ ]+]])
// CHECK-DTOR: call void @_Z3FooI1AEvOT_({{.*}} %[[SLOT]])
// CHECK-DTOR: call void @_ZN1AD1Ev(ptr nonnull {{[^,]*}} %[[SLOT]])
// CHECK-DTOR: call void @llvm.lifetime.end.p0(ptr nonnull %[[ADDR]])
// CHECK-DTOR: }
Foo(Baz<A>());
Foo(Baz<A>());
}
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